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Finding the Fourth Proportional to 1,347.80, 1,860.20 and 788.23

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Solution

The fourth proportional to 1,347.80, 1,860.20 and 788.23 is: 1,087.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,347.80 : 1,860.20 = 788.23 : x
  2. Step 2: Convert to fraction form
    1,347.80/1,860.20 = 788.23/x
  3. Step 3: Cross multiply
    1,347.80x = 1,860.20 × 788.23
  4. Step 4: Simplify right side
    1,347.80x = 1,466,270.11
  5. Step 5: Solve for x
    x = 1,466,270.11/1,347.80
  6. Step 6: Final answer
    x = 1,087.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.